Carpenters gather wood, examine plans, measure, cut, and build frames and supports. As one of their primary duties is to guarantee a structure's foundation is stable and secure, they execute all this precisely.
The ideal ratio for measurements to get a square corner is 3:4:5. A straight line should be three feet long, a perpendicular line should be four feet long, and the width should be five feet. The resulting corner will be completely square if all three measurements are accurate.
A carpenter will cost you around £10–£20 per hour.